Alexis Laferrière 5a49e34426 Serialization: Error on xref to implementation-only dependencies ...

Introduce a last resort check reporting references to
implementation-only dependencies that would appear in the generated
swiftmodule. This check is applied at serialization, long after
exportability checking applied at typechecking. It should act as a back
stop to references missed by typechecking or @_implementationOnly decls
that should have been skipped.

This check is gated behind CheckImplementationOnlyStrict and should be
used with embedded only.

rdar://160697599

2025-11-11 13:03:16 -08:00

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